180 90 80 60 40 20 100 120 140 160 Use of the focimeter 17.75 18.00 18.25 18.50 18.75 19.00 19.25 In order to do this, begin by turning the power adju
{"Image DocumentName": "- - Use of the focimeter + +", "Image ImageDescription": "Click to return. to CD contents Now rotate the adjustable eyepiece ring of the telescope to rack. out the eyepiece to its fullest extent. The protractor scale on the. graticule will become blurred until it is no longer in focus Then rotate the eyepiece. slowly back inwards until. the scales just come into. sharp focus. Stop as soon. as they come into focus Before you use a manually operated focimeter you. must adjust its focusing eyepiece for your own use In order to do this, begin by turning the power adjusting. knob right to one end of its reading range. It does not. matter whether it is the plus or minus end of the range. You will notice that the green target is so much out of. focus that it can no longer be seen. You should now find that the dioptric scale reads exactly zero. If it does not now read zero, the instrument needs servicing! Click to skip. to next topic. Click to return. to previous screen. Ophthalmic Lenses & Dispensing.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}